closes#172
- added type to ghost.settings()
- added /api/settings?type=<filter>
- added availableThemes to settingsCache
- removed cachedSettingsRequestHandler
- removed /api/themes (including front end)
- changed activePlugins to type "plugin" in default-settings.json
closes#625
- removed defaultLang, forceI18n and activePlugins from config
- added values to default-settings.json
- updated to use values from settings
closes#593
- added default setting of 6 posts per page
- added posts per page to settings page
- added limit to frontend.js (setting does not change API behavior)